What is the volatility$($standard deviation$)$ of a portfolio that consists of an equal investment in firms of type$$ S$?$

Standard deviation is

$$

enter your response here$\%.($Round to two decimal$$ places.$)$

Part $2$

b$.$ What is the volatility$($standard deviation$)$ of a portfolio that consists of an equal investment in firms of type$$ I?

Standard deviation is

$$

enter your response here$\%.($Round to two decimal$$ places